A: A blood moon is a deep reddening of the moon caused by the Earth passing between the moon and the sun. During the period of the eclipse, light from the sun... Full Answer >
Sometimes, bones are the only accessible source of DNA, thanks to their structure, which preserves DNA comparatively well and for a long time. The main problems of DNA extraction from bones are DNA degradation due to environmental factors and the presence of soil-derived inhibitors like humus acids [1â10].
It came from a fossilised leg bone of an early human who died about 400,000 years ago in what is now northern Spain. Scientists have extracted and sequenced the oldest human DNA. It came from a fossilised leg bone of an early human who died about 400,000 years ago in what is now northern Spain.